In recent years, sintered stainless steel with carbon addition has been proposed for potential use as exhaust flanges in automotive applications. The net-shaping requirements for such applications necessitate the use of powder metallurgical (P/M) processing route. However, due to the presence of porosity, most sintered steels have poor corrosion resistance. The present study compares the effect of sintering temperature, heating mode and graphite addition (up to 1.5%) on the densification and electrochemical response of both fcrritic (434L) and austenitic (316L) stainless steels. The compacts were sintered in both conventional (radiatively heated) as well as microwave furnace. As compared to conventional sintering, samples consolidated in microwaves have higher densification (particularly at 1200°C) and exhibit better corrosion properties.
All Science Journal Classification (ASJC) codes
- Metals and Alloys